One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(6,8)(7,11)(14,18)(16,20)(21,22,26,27)(23,30,28,24)(25,33,36,29)(31,32,34,35)(7,11)(10,12)(14,18)(15,19)(22,27)(23,28)(29,33)(31,34) involution — undirected(5,6,9,8)(7,10,11,12)(13,14,17,18)(15,16,19,20)(21,23,26,28)(22,24,27,30)(25,34,36,31)(29,35,33,32)(1,2,3,4)(5,7)(6,10)(8,12)(9,11)(13,15,17,19)(14,16,18,20)(21,24)(22,28)(23,27)(25,35)(26,30)(29,31)(32,36)(33,34)(5,8,9,6)(7,12,11,10)(13,16)(14,19)(15,18)(17,20)(21,25)(22,29)(23,31)(24,32)(26,36)(27,33)(28,34)(30,35)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.